天然沉积粉质黏土的应力路径试验研究

›› 2013, Vol. 34 ›› Issue (12): 3389-3392.

天然沉积粉质黏土的应力路径试验研究

殷杰^{1, 2}，刘夫江³，刘辰³，刘春伟⁴

1.河海大学岩土力学与堤坝工程教育部重点实验室，南京 210098；2. 江苏大学土木工程与力学学院，江苏镇江 212013； 3.山东临沂水利工程总公司，山东临沂 276000；4.临沂市南水北调工程管理处，山东临沂 276000

收稿日期:2013-07-17 出版日期:2013-12-10 发布日期:2013-12-19
作者简介:殷杰，男，1982年生，博士，讲师，主要从事软土基本特性与本构关系方面的研究工作
基金资助:
河海大学岩土力学与堤坝工程教育部重点实验室开放基金资助项目（No. GH201104）。

Stress path tests on natural sedimentary silty clay

YIN Jie^{1, 2}, LIU Fu-jiang³, LIU Chen³, LIU Chun-wei⁴

1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 3. Shandong Province Water Conservancy Project Head Company, Linyi, Shandong 276000, China; 4. Administration of South-to-North Water Transfer Project in Linyi City, Linyi, Shandong 276000, China

Received:2013-07-17 Online:2013-12-10 Published:2013-12-19

摘要/Abstract

摘要： 天然沉积土在沉积过程中产生了结构性和各向异性，使其受力变形特性与重塑土存在明显的差异。实际工程中的天然土体往往在受荷过程中会经历不同的应力路径，因此，需要开展考虑结构性和各向异性影响的应力路径试验。通过研究不同应力路径下土体的力学特性，为建立复杂应力路径下的合理的本构模型提供试验依据。采用大直径PVC管取样器获取张家港地区地下2.5 m深的粉质黏土不扰动土样，通过GDS三轴仪对土样进行了K0固结不同排水应力路径试验。结果表明，应力路径对不扰动土样的体积变形和剪切变形均有显著影响，且球应力和偏应力对土的体应变和剪应变存在交叉影响。无论以体积变形为主还是剪切变形为主的应力路径下，应力-应变曲线都有明显的屈服性状。通过描绘试验所得各应力路径下的屈服点，获得张家港不扰动土样的屈服轨迹大致呈倾斜的椭圆形状，采用Wheeler模型的屈服面与试验屈服点的吻合程度要优于Nakano模型。

关键词: K0固结, 粉质黏土, 应力路径, 不扰动样, 屈服

Abstract: Soil structure and anisotropy were generated during the depositional process for natural sedimentary soils, which made them different form that of the remolded soils. Since natural soils may generally undergo different stress paths during external loads in the engineering practice; it is necessary to carry out stress path tests on natural soils both considering the effects of soil structure and anisotropy. Analysis of mechanical behavior under different stress path tests can be the basis for set up reasonable constitutive model for natural soils. In this study, different K0 consolidation drained stress path triaxial tests were performed by GDS triaxial apparatus on undisturbed Zhangjiagang silty clays, which were taken by large diameter PVC samplers from depths of 2.5m underground. Test results show that stress paths exert significant influence on volumetric and shear deformation. Global stress and deviator stress have cross effects on the volumetric strain and shear strain. Obvious yielding behavior can be observed in stress-strain relations, whatever the stress paths are controlled by volume or shear deformation. Yielding curve obtained by connecting the yield points under different stress paths shows an incline elliptical shape, which agrees better with the yield curve in the constitutive model proposed by Wheeler et al. than that of the model presented by Nakano et al..

Key words: K0 consolidation, silty clay, stress path, undisturbed samples, yield

中图分类号:

TU 411

殷杰，刘夫江，刘辰，刘春伟,. 天然沉积粉质黏土的应力路径试验研究[J]. , 2013, 34(12): 3389-3392.

YIN Jie , LIU Fu-jiang , LIU Chen , LIU Chun-wei，. Stress path tests on natural sedimentary silty clay[J]. , 2013, 34(12): 3389-3392.

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